Free Online Tutorial For Programmers, Contains a Solution For Question in Programming. Quizzes and Practice / Company / Test interview Questions.
Data structures and algorithms Course Overview: This course covers the concept of data structure and algorithms All data structures have been explained with introduction, advantages and disadvantages The good images have been attached for every chapter which makes it easy to understand the concepts The algorithms have been explained with…
[su_youtube url="https://youtu.be/dtyH9XW3VDI" title="Arrays"]What is an array? An array is a collection of data items These items are similar types An array can also be called a list Properties an array An array can contain a group of elements of a similar type Array elements are stored in contiguous memory blocks…
Nullish coalescing operator The nullish coalescing operator(??) is a logical operator Returns its right-hand side operand when its left-hand side operand is null or undefined, and otherwise returns its left-hand side operand const name = null ?? 'John'; console.log(name); // John
How to avoid common errors in Javascript Introduction Now we have learned about error types and how to debug the errors Now there is a standard way of coding which can help in avoiding most of the common error types like ReferenceError and TypeError Use try-catch block To avoid errors…
How to debug errors in the javascript Introduction Now we have learned what are error types in the javascript and where we can find the error details Now it’s a time to learn how to debug the errors When any error occurs in the application, the error details can be…
Module in JavaScript Introduction Is a reusable piece of code Modules are building blocks of any complicated Software Module encapsulates implementation details Modules can be imported Modules can be exported Modules are imported synchronously Example Create file index.html Create a file script.js Create a file auth.js //index.html <html> <body> <script…
Concurrency model & event loop in Javascript Key points The event loop is responsible for executing the code collecting and processing events and executing queued sub-tasks JS Runtime Concepts The following sections explain a theoretical model Modern JavaScript engines implement and heavily optimize the described semantics Call Stack: Where the…
Classes in Javascript Introduction Classes are a template for creating objects They encapsulate data with code to work on that data The class syntax has two components: class expressions and class declarations Key points Class declarations are not hoisted Trying to access a class before declaring, gives a ReferenceError Class…
Object in Javascript Introduction JavaScript has an object entity with a combination of properties An object has the key-value pair Every element has a name which is called key Objects help to group together different variable that belongs to the same person or entity In object, the order doesn’t matter…
Events in Javascript Introduction Events are actions that happen in the system The system tells you about so you can respond to them in some way if desired For example, if the user selects a button on a webpage, you might want to respond to that action by displaying an…